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What are the symptoms of a bad heater motor resistor?

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What are the symptoms of a bad heater motor resistor?

Symptoms of a Bad or Failing Heater Blower Motor Resistor 1 Blower motor stuck on one speed A common symptom of a faulty blower motor resistor is a blower motor that is stuck on… 2 Blower motor does not work on certain settings Another common symptom of a faulty blower motor resistor is a a blower… 3 No air from the vehicle’s vents More

Where is the blower control switch on the dashboard?

The blower control switch on the dashboard controls the circuit flow of the blower motor to adjust the voltage from low, to medium, to medium-high, to high. When on high, the circuit bypasses the blower resistor.

What are the symptoms of a bad blower motor relay?

3. Melted relay. Another more serious symptom of a problem with the blower motor relay is a burned or melted relay. Relays are exposed to high current loads and can sometimes get hot when they develop problems.

Symptoms of a Bad or Failing Heater Blower Motor Resistor. 1 1. Blower motor stuck on one speed. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. The blower 2 2. Blower motor does not work on certain settings. 3 3. No air from the vehicle’s vents.

What does the resistor on a heater do?

It is responsible for controlling the blower motor’s fan speed. When fan speed is changed via the knob on the instrument cluster, the blower motor resistor changes setting, which changes the speed of the blower motor.

What happens when you replace a blower motor resistor?

In this case, the heater and air conditioning system may still function normally pushing the cold or hot air out of the vent beside the speed. The resistor needs to be replaced with a new one in order to restore its function. Another common symptom of a faulty blower motor resistor is that the blower motor only works at slow-speed.

How much does it cost to replace a heater motor resistor?

The average cost of a blower motor resistance replacement is between $80 and $150, and labor costs are estimated between $35 and $80, with the price of the unit between $50 and $75. The estimate does not include taxes and fees. Founder, owner & main author of Mechanic Base.

Symptoms of a Bad or Failing Heater Blower Motor Resistor. 1 1. Blower motor stuck on one speed. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. The blower 2 2. Blower motor does not work on certain settings. 3 3. No air from the vehicle’s vents.

It is responsible for controlling the blower motor’s fan speed. When fan speed is changed via the knob on the instrument cluster, the blower motor resistor changes setting, which changes the speed of the blower motor.

The average cost of a blower motor resistance replacement is between $80 and $150, and labor costs are estimated between $35 and $80, with the price of the unit between $50 and $75. The estimate does not include taxes and fees. Founder, owner & main author of Mechanic Base.

In this case, the heater and air conditioning system may still function normally pushing the cold or hot air out of the vent beside the speed. The resistor needs to be replaced with a new one in order to restore its function. Another common symptom of a faulty blower motor resistor is that the blower motor only works at slow-speed.

What does it mean if your blower motor is not working?

Average rating from 849 customers who received a AC is not working Inspection. The blower motor resistor is an electrical component that is a part of the vehicle’s heating and air conditioning system. It is responsible for controlling the blower motor’s fan speed.

3. Melted relay. Another more serious symptom of a problem with the blower motor relay is a burned or melted relay. Relays are exposed to high current loads and can sometimes get hot when they develop problems.

Why does my Chevy Silverado heater not work?

Check the HVAC BLWRfuse in the underhood fuse panel. If this fuse is good, the most likely problem is a bad blower speed control module (8). This module is located under the passenger side of the dash near the blower motor. Dave Nova, Chevrolet Technician

What are the symptoms of a bad heater motor?

One of the first symptoms of a potential problem with the vehicle’s heater blower motor is low airflow from the vents. If when the air or heat is turned on the vents blower noticeably less, or weaker air, that may be a sign that the heater blower motor is starting to wear out.

Why is my heater blower motor not working?

Most blower motors are designed to operate at different speeds in order to be able to regulate different cabin temperatures efficiently. If the blower motor fails to push air at any of it’s designed settings then it may be faulty.

What causes a bad or failing blower motor relay?

Blown fuses. One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay circuit fuse. If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current…

When to replace a car heater blower motor?

If your car’s heater doesn’t work, only works on certain speeds, or only cold air comes out, you may need to replace the heater blower motor. 1. Weak airflow from the vents 2. Fan only blows at certain speeds 3. No air from the vents Average rating from 130,525 customers who received a Vehicle Engine Cooling Inspection.

Why does my AC blower motor work intermittently?

Intermittent electrical problems can make you feel like your a blind man trying to catch a stray dog. You can’t post conmments that contain an email address.

What does the blower motor resistor do in a car?

The blower motor resistor is an electrical component that is a part of the vehicle’s heating and air conditioning system. It is responsible for controlling the blower motor’s fan speed. When fan speed is changed via the knob on the instrument cluster, the blower motor resistor changes setting, which changes the speed of the blower motor.

What are the symptoms of a worn out blower motor?

One of the symptoms of a worn out blower motor is that it can intermittently produce a loud screeching noise when running. How to test a blower motor? If the blower motor doesn’t work at all, the blower motor itself must be tested first. Typically it’s done by measuring the voltage at the blower motor connector when it’s turned on.

Intermittent electrical problems can make you feel like your a blind man trying to catch a stray dog. You can’t post conmments that contain an email address.

The blower motor resistor is an electrical component that is a part of the vehicle’s heating and air conditioning system. It is responsible for controlling the blower motor’s fan speed. When fan speed is changed via the knob on the instrument cluster, the blower motor resistor changes setting, which changes the speed of the blower motor.

Why is my Mercedes heater blower not working?

I was told by the service manager that when he was placing the order for more heater blower motors that the parts warehouse said they had experienced similar issues with other Mercedes blower motors, so I’m wondering if there’s a underlying problem with the motor manufacturing process.

What happens when a blower motor resistor fails?

The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed.

What happens if a heater blower has no power?

A blower motor without power will not be able to produce any air pressure, and as a result the heating and air conditioning system will be left with no air coming from the vents.

What kind of blower motor does a Chevy Tahoe have?

See and discover other items: blower motor fan, blower motors, ,2003 chevy tahoe, 2004 gmc, 2005 chevy avalanche, 2004 gmc tahoe products There’s a problem loading this menu right now.

Why does my GM blower motor resistor keep failing?

In some cases, the heat is so high that it melts the connector. This is common on late model GM vehicles. If you discover a melted connector, do NOT attempt repair. Purchase an upgraded pigtail and splice it into the harness along with a new blower motor resistor.

Why does my Chevy Silverado blower motor not run?

If the blower motor runs when all of the terminals were jumped together, it means the circuit between the resistor connector and blower motor is fine as well as the blower’s motor relay, but the blower resistor is bad and needs to be replaced.

The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed.

A blower motor without power will not be able to produce any air pressure, and as a result the heating and air conditioning system will be left with no air coming from the vents.

Why is the resistor not working on my blower?

Hi There, The resistor is what controls the speed of the blower motor, not the relay. The blower motor relay supplies power to this motor when you turn the switch to “on” that can sometimes fail. When this happens, you may notice that you will not feel anything blowing out of the vents at all.

How is the speed of the blower motor controlled?

The blower resistor is connected in series to the blower fan motor. This means that the current running through the blower motor, and its’ speed is therefore controlled by the resistor value. The user chooses a fan speed by selecting a speed which then connects one of the resistors in the blower resistor pack.

How do you replace a blower motor resistor?

Remove the screws that secure the blower motor resistor to the housing… and put them someplace safe. At this point, you can remove the resistor from the housing. Take your new resistor… put it in position… and install it using the screws that held the old resistor in place.

Average rating from 849 customers who received a AC is not working Inspection. The blower motor resistor is an electrical component that is a part of the vehicle’s heating and air conditioning system. It is responsible for controlling the blower motor’s fan speed.

When do you need to replace the fan resistor?

If your interior AC/ Heat fan is not working on low, or one of the fan settings is not working, then you probably need to replace the blower motor resistor. This video will go though all of the steps. Is your blower fan working only on the max (4 speed)? This is a common problem with the Volkswagen, Audi, Seat, Skoda cars.

Why is my blower motor resistor not working?

The blower motor resistor controls the speed of the blower motor indirectly by relaying electrical current to the blower motor control module. If the resistor isn’t working properly, then you’ll experience concerning and inconvenient symptoms in your BMW’s cabin.

What happens when the resistor on a blower fan goes bad?

When the resister of the blower motor starts to fail, the motor operates only intermittently. This often presents itself as the blower fan not kicking on until the engine is producing a certain level of electric current. The higher current can make the jump across the resistor contacts that are going bad and get the blower motor to engage.

Why does my Dakota blower resistor keep going bad?

When your Dakota or Durango left the factory, it had a Mopar motor and voltage resister that were compatible with each other. After 10-15 years the motor wears out , begins to draws more amps burns up the resister. Most people replace the wiring harness and the resister with. cheap replacement from Autozone / Advanced etc.

What happens if heater blower motor does not work?

Therefore, if major problems in the heating and air conditioning system fail, as if the power supply to the motor was completely cut off due to overheating or corrosion, the motor will simply not work, which in turn will render the entire heating and air conditioning system unusable, as no air will flow through the vehicle’s air vents. 2.

Why does my heater not work on high speed?

Heater blower motor will not work on high speed? I have replaced the black bosch relay behind the glovebox, the blower resistor and the blower motor and still cannot get the blower to work on high. I remember in older model years of gmc’s and chevys that their was a high speed blower relay that caused this issue.

Why does my GMC heater blower not work?

I have replaced the black bosch relay behind the glovebox, the blower resistor and the blower motor and still cannot get the blower to work on high. I remember in older model years of gmc’s and chevys that their was a high speed blower relay that caused this issue. If there is a high speed relay, I can’t find it. Any suggestions?

Why is my car heater not working properly?

A leaky radiator could prevent coolant from reaching your heater core and could damage your engine, at worst. Simply put, your car’s buttons, knobs, or haptic feedback touchscreens may not be triggering the heating system. Shorts, broken dials, and bad touchscreens can all lead to malfunctions that prevent your heater from working.

When do you need to replace the blower motor relay?

If the blower motor does not function, car fuses are blown, or relays are melting, you may have to replace the car blower motor relay. 1. Blower motor does not function 2. Blown fuses 3. Melted relay The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor.

Why is my front AC blower not working?

I’ve seen many posts from people whose front AC blower would stop occasionally. My wife would kick the wires under the glove compartment and it would start again. It finally failed altogether. Following the advice from other owners, I replaced the blower motor resistor. That didn’t help.

Where does the power go in a blower motor?

For each higher speed, power flows through one less resistor. Some car makers run blower motor power through the fan speed switch first, then through the blower motor resistor and then to the blower motor and ground. Other car makers reverse that and run power to the blower motor first and terminate ground at the blower fan speed switch.


How do you replace the blower motor on a Dodge Ram?

Once the wire harness has been disconnect and the rubber hose unplugged, there are only three bolts holding the blower motor up. Use a Phillips screwdriver or ratchet with 8mm socket to remove the three mounting bolts. You may need to switch between the two tools if the bolts are difficult to remove.

Can you play Dodge Caravan blower motor resistor?

To avoid this, cancel and sign in to YouTube on your computer. An error occurred. Please try again later. (Playback ID: jkTremrxddfa3V3y) An error occurred while retrieving sharing information. Please try again later.

Where is the blower motor resistor located on a car?

It’s located inside the dash, often on the opposite side of the steering wheel or inside the engine compartment on the firewall. A blower motor resistor or a blower motor control module is the part that controls the speed of the blower motor.

What are the symptoms of a failed blower motor resistor?

Blower motor resistor problems. Problems with a blower motor resistor are common in many cars. The most common symptom of a failed blower motor resistor is when the heater fan only runs at high speed and doesn’t work at low speeds.

Why is the resistor on my Ford Escape not working?

For example, as you can see in this photo, the blower motor resistor in this Ford Escape has failed due to corrosion. If the resistor shows no visual damage, the resistance between terminals must be checked and compared to specifications. If the resistance is out of specs, the resistor must be replaced.

How much does it cost to replace a blower motor resistor?

The blower motor resistor or control module replacement is not very expensive. For example, one of our colleagues had a problem with his 2011 Ford Escape: the fan only worked at the speed 4. He paid $50 to diagnose and $112 to replace the resistor at a local Ford dealership.

What causes a blower motor to stop working?

In a situation where the motor doesn’t work on any speed, the most likely causes are: a blown power supply fuse, a bad motor ground connection, bad motor speed control module or a failed motor. On all systems, a failed blower motor is least likely. Blower motors generally don’t fail out of the clear blue.

Why is my Dodge Stratus heater not working?

While there are a variety of reasons your Dodge Stratus heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.

What to do if your Ford Fusion heater is not working?

When the blower motor resistor fails, the air conditioner and heater may still work, but air may blow from the vents at only some of the fan speed settings. If the resistor isn…

What should I do if my blower motor resistor keeps failing?

Purchase an upgraded pigtail and splice it into the harness along with a new blower motor resistor. Conduct an amperage draw test at the same time to rule out excessive current draw from the blower motor. Car makers design their HVAC systems to reduce the possibility of debris getting into the system. But they’re not always successful.

How does the heater work on a Ford F250?

At the simplest level possible, the heater works by passing hot coolant from the engine into a tiny radiator called the heater core. At this point, the blower motor blows air across the it and the newly heated air blows on to the driver and passengers. If the heater has stopped working in your F250, this process has failed in one way or another.

Where is the heater resistor on a Ford F150?

It is located around the right kick panel under the glove box. Trace the wiring bundle you will find it there. Disconnect the wiring harness then remove the two 8 mm hexhead mounting screws pointing up to the glove box, the resistor will come out easily. Loading…

How to fix a Ford F150 heater blower?

Trace the wiring bundle you will find it there. Disconnect the wiring harness then remove the two 8 mm hexhead mounting screws pointing up to the glove box, the resistor will come out easily. Loading…

Why is my Ford F 250 heater not working?

While there are a variety of reasons your Ford F-250 heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.

Why does my Ford F-250 only run on high setting?

Share it! The 2004-2010 Ford F-250 with manual temperature and fan controls may have problems with the the blower motor only blowing air on certain settings. Most commonly the fan will only run on the highest setting. This is a well documented problem, and is caused by a failing blower motor resistor.

Where is the resistor on a Ford F-250?

Correcting the problem is straight forward, and requires replacement of the small resistor. The resistor is normally found behind the glove box, next to the blower motor. The average cost for a Ford F-250 Super Duty Blower Motor Resistor Replacement is between $56 -$63.

Therefore, if major problems in the heating and air conditioning system fail, as if the power supply to the motor was completely cut off due to overheating or corrosion, the motor will simply not work, which in turn will render the entire heating and air conditioning system unusable, as no air will flow through the vehicle’s air vents. 2.

What happens when heater resistor pack goes bad?

The thermal fuse/trip. If the Heater Resistor Pack goes faulty, the user may find that the blower stops working on one or more of its speeds. Or it may run at maximum speed on all settings, or just work on maximum and not on lower speeds, or it may simply not run at all.

What to do if your heater motor stops working?

They wanted over 500, including diagnose, and the ign. cable, which it didn’t need. I had my blower motor go out then I replaced the fan motor and it is working but got a immediate. Dash light for engine could the ignition switch be bad too.

What causes a furnace blower fan to stop too early?

Several defects can cause early burner shut-down such as: a dirty air filter reducing air flow through the heater. a dirty blower fan assembly that reduces air flow through the heater. improperly set controls. shorted wiring. other stuff I haven’t thought-of.

Why is my blower motor stuck on one speed?

Blower motor stuck on one speed A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed.

Is there a resistor for a Ford F150 heater?

Blower motor resistor with heater and dealer A/C ( C9AZ-18591-A) is different than with factory installed integral AC and Hi/Low Comfort Vent System ( D3TZ-19706-A ). dustybumpers likes this. Having the same problem with my 84 F150.Would a resistor from a salvage yard be serviceable?Or should I look for a NOS unit? Good luck.Have fun.Be safe.

Is there a blower resistor on a Ford F100?

Let me know, I’ll fire the old beast up and see if I can find them Blower motor resistor with heater and dealer A/C ( C9AZ-18591-A) is different than with factory installed integral AC and Hi/Low Comfort Vent System ( D3TZ-19706-A ).


The blower motor resistor or control module replacement is not very expensive. For example, one of our colleagues had a problem with his 2011 Ford Escape: the fan only worked at the speed 4. He paid $50 to diagnose and $112 to replace the resistor at a local Ford dealership.

What should the resistance of a blower motor resistor be?

For example, in this photo we measured the resistance of this blower motor resistor. According to the service manual, it must be around 4-5 ohms. In our case the ohmmeter shows open circuit, which means the resistor has failed. Sometimes, a blower motor resistor might fail due to problems with the blower motor itself.

When to change the resistor on a heater?

You should also check the blower itself so you dont end up changing the resistor again in a few days/weeks when it blows out again because the blower motor is starting to go bad.

How to test the blower motor resistor ( GMC )?

Thankfully, testing the blower motor resistor is not that hard and in this tutorial I’ll show you 4 different tests that will help you troubleshoot it and find out if it’s bad (or not). This tutorial applies to several Chevrolet, GMC and Oldsmobile pickups and SUVs.

Thankfully, testing the blower motor resistor is not that hard and in this tutorial I’ll show you 4 different tests that will help you troubleshoot it and find out if it’s bad (or not). This tutorial applies to several Chevrolet, GMC and Oldsmobile pickups and SUVs.

When to replace the heater fan control switch?

If you have replaced the blower motor and blower motor resistor on your ’95-’98 GM truck or SUV, and your fan only works on high or doesn’t turn on at all, your heater fan control switch needs to be replaced. This video explains on how to do replace this part. Thanks for watching. Loading…

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Ruth Doyle